Research on Flexural Bearing Capacity of Reinforced Hollow Slab Beams Based on Polyurethane Composite Material Positive and Negative Pouring Method

In order to explore the construction technology of prestressed steel strand–polyurethane cement composites for strengthening hollow slab beams, two reinforced test beams (L1, L2) and one unreinforced beam (L0) were subjected flexural static load tests. The deflection, ductility, stiffness, strain, bearing capacity each used summarize influence different reinforcement techniques on performance beams. Research shows composite material was well-bonded beam, which effectively inhibits development concrete cracks delays damage process that effect L1 under reverse pouring remarkable, bending L2 forward simulated real bridge good, much better than L0. use tensile strands casting polyurethane–cement materials improved this can be further extended engineering applications.